[tor-bugs] #19625 [Core Tor/Tor]: Allow relays to set peering policy

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#19625: Allow relays to set peering policy
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     Reporter:  twim          |      Owner:
         Type:  project       |     Status:  new
     Priority:  Medium        |  Milestone:
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:
Actual Points:                |  Parent ID:
       Points:                |   Reviewer:
      Sponsor:                |
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 As mentioned in the discussion at tor-relays@ ([1], [2]), it would be nice
 to have some kind of peering policy for relays so that relay operators
 could restrict connections with suspicious/malicious relays themselves.

 Having PeeringPolicy similar to ExitPolicy (accept, reject) is what comes
 to mind first. Though it may not be the best solution.

 Also, as a side effect it can allow to have smaller state table/less file
 descriptors for average relay that can help with scaling of the network in
 the future.

 [1] https://lists.torproject.org/pipermail/tor-
 relays/2016-July/009633.html
 [2] https://lists.torproject.org/pipermail/tor-
 relays/2016-July/009641.html

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/19625>
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